I discovered today that my most played game on Steam is Astronner with about 500 hours, and my second most played is Surviving Mars with about 500 hours.
500 hours is also my sweet spot I think - I don't think I have any games with significantly more than that. Here are the games I have ~500 hours in (that I can remember off the top of my head):
Breath of the Wild
Civ IV
Dark Souls
Monster Hunter World
Skyrim
Warframe
If entire series count though, it's gotta be Civ, by a landslide.
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500 hours is also my sweet spot I think - I don't think I have any games with significantly more than that. Here are the games I have ~500 hours in (that I can remember off the top of my head):
Breath of the Wild
Civ IV
Dark Souls
Monster Hunter World
Skyrim
Warframe
If entire series count though, it's gotta be Civ, by a landslide.